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Reading device and multichannel reading device for touch-control panel

A touch panel and reading device technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve the problem that capacitive touch panels and touch panel reading devices cannot be used with narrow flexibility and other issues to achieve the effect of reducing the occupied chip area, reducing the chip area, and reducing the area

Inactive Publication Date: 2011-05-04
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

E.g, image 3 The capacitance value of the feedback capacitor Cfb is much larger than the capacitance value of the feedback capacitor Cfb, so the reading circuit 140 used for the optical charge touch panel 110 cannot be applied to the capacitive touch panel 310
If each type of touch panel needs to use a reading circuit with different functions, the flexibility of using the touch panel reading device will be relatively narrow

Method used

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  • Reading device and multichannel reading device for touch-control panel
  • Reading device and multichannel reading device for touch-control panel
  • Reading device and multichannel reading device for touch-control panel

Examples

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Embodiment Construction

[0031] The following embodiments will take the optical charge touch panel 110 and the optical current touch panel 210 as examples to illustrate the application examples of the reading device of the present invention. However, the scope of application of the present invention should not be limited thereto.

[0032] Figure 4 It is a schematic circuit diagram illustrating a reading device 400 for a touch panel according to an embodiment of the present invention. The input end of the reading device 400 is coupled to the sensing line of the touch panel 401, and the output end of the reading device 400 sends the reading result to the subsequent circuit (including the analog-to-digital converter and the image processing circuit, not shown here. Shown) to determine the coordinates of the touch position. This touch panel 401 can be a charge type touch panel (such as figure 1 The shown optical charge touch panel 110) can also be a current touch panel (such as figure 2 The optogalv...

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Abstract

The invention relates to a reading device and a multichannel reading device for a touch-control panel, which are used for integrating reading circuits of different types. A reading device in a first mode reads a touch-control panel with few quantity of electric charge by utilizing an integrator; a reading device in a second mode reads the sensing current of a current touch-control panel by utilizing a current-to-voltage conversion unit and an inverting amplifier to save the area of chips; and a multichannel reading device in a third mode shares a group of integrators with large-capacitance (or area) feedback capacitors (integral capacitors) in turn by a plurality of channels, so that the number of the large-area feedback capacitors can be reduced substantially. Therefore, the embodiment of the invention can be suitable for touch-control panels of different types except for fulfilling the aim of reducing the area of the chips.

Description

technical field [0001] The present invention relates to a touch device, and in particular to a reading device for a touch panel. Background technique [0002] With the vigorous development of electronic technology and the popularization of wireless communication and network, various electronic devices have gradually become an indispensable tool in life. However, common input and output (input / output, I / O) interfaces, such as a keyboard or a mouse, are quite difficult to operate. In contrast, a touch panel is an intuitive and simple input and output interface. Therefore, the touch panel is often used as a man-machine interface between people and electronic devices to perform control. [0003] In general, touch panels can be classified into resistive touch panels, optical touch panels, capacitive touch panels, and the like. According to the readout method, it can be divided into current type touch panel (current type touch panel) and charge type touch panel (charge type tou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041
Inventor 庄凯岚李国铭陈英烈
Owner HIMAX TECH LTD
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